×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Carburization of A-106B Tubes

Carburization of A-106B Tubes

Carburization of A-106B Tubes

(OP)
We have a lean oil heating furnace with A-106b tubes.  The approximate tube temperature (surface) is 750F.  We have a haz-op item on this that says we need to verify that the tubes are not susceptible to carburization.  Can someone lead me to a reference chart, or some other text to help me verify this. Thanks.

RE: Carburization of A-106B Tubes

A-106 material is prone to graphitization when exposed to temps > 800F for long periods of time (ASME B31.3 Notes for App. A). As for carburization, I wouldn't expect much at temperatures below 800F.

RE: Carburization of A-106B Tubes

AEF has it!  
Carburized surfaces have diffused carbon enrichment at the surface which makes the surface a higher carbon alloy and allows local hardening.  This would not occur at 750F.  

AEF surmises you mean "graphitization", which is a slow process converting carbon in the pearlite from an iron carbide to the graphitic form of carbon and weakening the steel.  This also is so slow at 750F it is a non-issue.  You can test for it metallurgically with in-field metallography/replication or by destructive testing of removed samples - welds are usually selected.  The main message you should sell is that this normally is not necessary at 750F

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources